Update dependency rxjs to v6.5.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
rxjs	devDependencies	patch	6.5.1 -> 6.5.2	source

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Release Notes

reactivex/rxjs

v6.5.2

Compare Source

Bug Fixes

• endWith: wrap args - they are not observables - in of before concatenating (#​4735) (986be2f)
• forkJoin: test for object literal (#​4741) (c11e1b3), closes #​4737 #​4737
• Notification: replace const enum (#​4556) (e460eec), closes #​4538
• of: remove deprecation comment to prevent false positive warning (#​4724) (da69c16)
• pairwise: make it recursion-proof (#​4743) (21ab261)
• scan: fixed declarations to properly support different return types (#​4598) (126d2b6)
• Subscription: Return Empty when teardown === null (#​4575) (ffc4e68)
• throttleTime: emit single value with trailing enabled (#​4564) (fd690a6), closes #​2859 #​4491
• umd: export fetch namespace (#​4738) (7926122)
• fromFetch: don't abort if fetch resolves (#​4742 (ed8d771)

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